JLabel change text if JDialog is visible
import javax.swing.*;
import javax.swing.border.CompoundBorder;
import java.awt.*;
import java.awt.event.*;
public class HotelRoomsGUI extends JPanel{
    private JTabbedPane mainJTP;
    private JPanel classicTab,deluxeTab,presidentialTab,classicSubPanel,deluxeSubPanel,presidentialSubPanel;
    private String classicRoomNo[] = {"101","102","103","104","105","106","107","108","109","101","111","112"};
    private String deluxeRoomNo[] = {"201","202","203","204","205","206","207","208","209","201","211","212"};
    private String presidentialRoomNo[] = {"301","302","303","304","305","306","307","308","309","301","311","312"};
    private JButton[] classicRoom, deluxeRoom, presidentialRoom;
    private JLabel[] inputLabels;
    ButtonHandler bh;
    public HotelRoomsGUI(){

        setLayout(null);
        setBackground(new Color(90,90,90));
        add(tabbedPane());

    }
    public JPanel classic()
    {
        classicTab = new JPanel();
        classicTab.setBackground(new Color(70,70,70));
        classicTab.setLayout(null);
        classicSubPanel();
        return classicTab;
    }
    public JPanel classicSubPanel()
    {
        classicSubPanel = new JPanel();
        classicSubPanel.setBounds(10,10,605,455);
        classicSubPanel.setLayout(new GridLayout(4,3,10,10));
        classicSubPanel.setBackground(new Color(70,70,70));
        classicTab.add(classicSubPanel);
        return classicTab;
    }
    public JPanel deluxe()
    {
        deluxeTab = new JPanel();
        deluxeTab.setBackground(new Color(70,70,70));
        deluxeTab.setLayout(null);
        deluxeSubPanel();
        return deluxeTab;
    }
    public JPanel deluxeSubPanel()
    {
        deluxeSubPanel = new JPanel();
        deluxeSubPanel.setBounds(10,10,605,455);
        deluxeSubPanel.setLayout(new GridLayout(4,3,10,10));
        deluxeSubPanel.setBackground(new Color(70,70,70));
        deluxeTab.add(deluxeSubPanel);
        return deluxeSubPanel;
    }
    public JPanel presidential()
    {
        presidentialTab = new JPanel();
        presidentialTab.setBackground(new Color(70,70,70));
        presidentialTab.setLayout(null);
        presidentialSubPanel();
        return presidentialTab;
    }
    public JPanel presidentialSubPanel()
    {
        presidentialSubPanel = new JPanel();
        presidentialSubPanel.setBounds(10,10,605,455);
        presidentialSubPanel.setLayout(new GridLayout(4,3,10,10));
        presidentialSubPanel.setBackground(new Color(70,70,70));
        presidentialTab.add(presidentialSubPanel);
        return presidentialSubPanel;
    }
    //Holder of buttons
    public JTabbedPane tabbedPane()
    {
        UIManager.put("TabbedPane.selected", Color.ORANGE);
        mainJTP = new JTabbedPane();
        mainJTP.setBackground(Color.WHITE);
        mainJTP.setBounds(3,1,630,500);
        mainJTP.addTab("Classic",classic());
        mainJTP.addTab("Deluxe",deluxe());
        mainJTP.addTab("Presidential",presidential());
        rooms();
        return mainJTP;
    }
    //Labels that will be display on the RoomProfile class
    public JLabel[] inputLabels()
    {
        inputLabels = new JLabel[10];
        for(int x = 0; x<inputLabels.length;x++)
        {
            inputLabels[x] = new JLabel();
            inputLabels[x].setForeground(Color.WHITE);
        }
        return inputLabels;
    }
    public void rooms()
    {
        bh = new ButtonHandler();
        presidentialRoom = new JButton[presidentialRoomNo.length];
        deluxeRoom = new JButton[deluxeRoomNo.length];
        classicRoom = new JButton[classicRoomNo.length];
        for(int x = 0;x<classicRoomNo.length;x++){
            //classic rooms
            ImageIcon imageC = new ImageIcon("C:\Users\John\workspace" +
                    "\SystemTest\src\Images\classicRooms.JPG"); // image
            classicRoom[x] = new JButton(classicRoomNo[x],imageC);
            classicRoom[x].setBackground(Color.WHITE);
            classicRoom[x].setBorder(new CompoundBorder(BorderFactory.createEtchedBorder(Color.WHITE,Color.GRAY),
                    BorderFactory.createEtchedBorder(Color.WHITE,Color.GRAY)));
            classicRoom[x].addActionListener(bh);
            classicSubPanel.add(classicRoom[x]);
            //deluxe rooms
            ImageIcon imageD = new ImageIcon("C:\Users\John\workspace" +
                    "\SystemTest\src\Images\deluxeRooms.JPG"); // image
            deluxeRoom[x] = new JButton(deluxeRoomNo[x],imageD);
            deluxeRoom[x].setBackground(Color.WHITE);
            deluxeRoom[x].setBorder(new CompoundBorder(BorderFactory.createEtchedBorder(Color.WHITE,Color.GRAY),
                    BorderFactory.createEtchedBorder(Color.WHITE,Color.GRAY)));
            deluxeRoom[x].addActionListener(bh);
            deluxeSubPanel.add(deluxeRoom[x]);
            //presidential rooms
            ImageIcon imageP = new ImageIcon("C:\Users\John\workspace" +
                    "\SystemTest\src\Images\presidentialRooms.JPG"); // image
            presidentialRoom[x] = new JButton(presidentialRoomNo[x],imageP);
            presidentialRoom[x].setBackground(Color.WHITE);
            presidentialRoom[x].setBorder(new CompoundBorder(BorderFactory.createEtchedBorder(Color.WHITE,Color.GRAY),
                    BorderFactory.createEtchedBorder(Color.WHITE,Color.GRAY)));
            presidentialRoom[x].addActionListener(bh);
            presidentialSubPanel.add(presidentialRoom[x]);

        }
    }
    public class ButtonHandler implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            //to get what button is accessed
            Room room = new Room(e.getActionCommand());
            //get all info using the room no. got from getActionCommand();
            GuestsInfo info = new GuestsInfo(room.getGuestID());
            String data[] = {info.getFirstName()+" "+info.getLastName(),info.getAge(),info.getGender(),
                    info.getContactNo(),"Today",info.getTime(),"Tomorrow",room.getRoomNo(),room.getRoomType()};
            RoomProfile prof = new RoomProfile();
            if(prof.isVisible())
            {
                System.out.print("test");
            }
            else
            {

                //setting text on label
                prof.setVisible(true);
                inputLabels();
                for(int i = 0; i<data.length; i++){
                    inputLabels[i].setText(" "+data[i]);
                    System.out.println(""+data[i]);
                }
            }
        }
    }

}

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class RoomProfile extends JDialog{

    private JLabel[] labels;
    JLabel inputLabels[];
    private String topTextLabels[] = {"Fullname","Age","Gender","Address","Contact No","Arrival", "Time in", "Departure","Room No","Room Type"};
    private JButton okB;
    private JPanel subFrame,topPanel, bottomLeftPanel,bottomRightPanel;
    private JLabel designLabel;
    private ButtonHandler bh;
    private HotelRoomsGUI label = new HotelRoomsGUI();
    public RoomProfile() {
        setLayout(null);
        setModal(true);
        setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
        setBackground(new Color(80,80,80));
        setContentPane(setSubFrame());
        setSize(600,500);
        setLocationRelativeTo(null);
    }
    public JPanel setSubFrame()
    {
        createLabels();
        buttons();
        designLabel();
        subFrame = new JPanel();
        subFrame.setBounds(0,0,600,500);
        subFrame.setBackground(new Color(90,90,90));
        subFrame.setLayout(null);
        subFrame.add(setTopPanel());
        subFrame.add(setBottomRightPanel());
        subFrame.add(setBottomLeftPanel());
        subFrame.add(okB);
        subFrame.add(designLabel);
        return subFrame;
    }
    public void designLabel()
    {
        ImageIcon img = new ImageIcon("C:\Documents and Settings\Janpol\workspace\HotelGUI\src\Images\Account.JPG");
        designLabel = new JLabel(img);
        designLabel.setBounds(380,27,190,190);
        designLabel.setBorder(BorderFactory.createEtchedBorder(Color.GRAY,Color.BLACK));

    }
    // this is where i added some of the labels
    public JPanel setTopPanel()
    {
        topPanel = new JPanel();
        topPanel.setLayout(new GridLayout(5,1));
        topPanel.setBounds(20,20,350,200);
        topPanel.setBackground(new Color(90,90,90));
        topPanel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(Color.GRAY,Color.BLACK)
                ,"Personal Information",1,2,new Font("Arial",Font.BOLD,13),Color.ORANGE));
        JLabel[] top = label.inputLabels();
        for(int x = 0; x<5; x++)
        {
            topPanel.add(labels[x]);
            topPanel.add(top[x]);
        }

        return topPanel;
    }
    // also here
    public JPanel setBottomLeftPanel()
    {
        bottomLeftPanel = new JPanel();
        bottomLeftPanel.setLayout(new GridLayout(3,2));
        bottomLeftPanel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(Color.GRAY,Color.BLACK)
                ,"Stay Information",1,2,new Font("Arial",Font.BOLD,13),Color.ORANGE));
        bottomLeftPanel.setBackground(new Color(90,90,90));
        bottomLeftPanel.setBounds(20,250,300,140);
        JLabel[] bot = label.inputLabels();
        for(int x = 5; x<8; x++)
        {
            bottomLeftPanel.add(labels[x]);
            bottomLeftPanel.add(bot[x]);
        }
        return bottomLeftPanel;
    }
    // lastly here
    public JPanel setBottomRightPanel()
    {
        bottomRightPanel = new JPanel();
        bottomRightPanel.setLayout(new GridLayout(2,2));
        bottomRightPanel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(Color.GRAY,Color.BLACK)
                ,"Personal Information",1,2,new Font("Arial",Font.BOLD,13),Color.ORANGE));
        bottomRightPanel.setBackground(new Color(90,90,90));
        bottomRightPanel.setBounds(350,250,200,140);
        JLabel[] right = label.inputLabels();
        for(int x = 8; x<10; x++)
        {
            bottomRightPanel.add(labels[x]);
            bottomRightPanel.add(right[x]);
        }
        return bottomRightPanel;
    }

    public JLabel[] createLabels()
    {
        labels = new JLabel[topTextLabels.length];

        for(int x = 0; x<topTextLabels.length;x++)
        {
            labels[x] = new JLabel(topTextLabels[x]);
            labels[x].setForeground(Color.WHITE);
                    }
        return labels;
    }
    public void buttons()
    {
        bh = new ButtonHandler();
        okB = new JButton("Ok");
        okB.setBounds(400,400,100,50);
        okB.addActionListener(bh);
    }

    public class ButtonHandler implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
                dispose();
        }
    }

}

import java.sql.*;

public class Room
{

    private String roomType, availability, roomNo, Rate;
    private int  guestID;

    private Connection con;
    private PreparedStatement statement = null;

    public Room(){
        try {
             Class.forName("com.mysql.jdbc.Driver");
             con = DriverManager.getConnection(
                            "jdbc:mysql://localhost:3306/3moronsdb","root","");

        }
        catch (Exception e) {
             e.printStackTrace();
        }
    }
    public Room(int id)
    {
        this();
        try{
            statement = con.prepareStatement("SELECT * FROM room WHERE guestID=?");
            statement.setInt(1, id);
            ResultSet rs = statement.executeQuery();
            while(rs.next()){
                this.guestID = rs.getInt(1);
                this.roomType = rs.getString(2);
                this.roomNo = rs.getString(3);
                this.Rate = rs.getString(4);
                this.availability= rs.getString(5);
            }
        }catch(Exception e){
            System.out.print(e);
        }
    }
    //Constructor for setting rate
    public Room(String roomTypeL, String roomNoL , String RateL, String availabilityL)
    {
        this();
        try
        {
            statement = con.prepareStatement("Insert into room(roomType, roomNo, rate,availability) values(?,?,?,?)");
                statement.setString(1, roomTypeL);
                statement.setString(2, roomNoL);
                statement.setString(3, RateL);
                statement.setString(4, availabilityL);
                statement.executeUpdate();
        }
        catch(Exception e)
        {
            e.printStackTrace();
            return;
        }
    }
    public Room(String roomNo){
        this();
        try{
            statement = con.prepareStatement("SELECT * FROM room WHERE roomNo=?");
            statement.setString(1, roomNo);
            ResultSet rs = statement.executeQuery();
            while(rs.next()){
                this.guestID = rs.getInt(1);
                this.roomType = rs.getString(2);
                this.roomNo = rs.getString(3);
                this.Rate = rs.getString(4);
                this.availability= rs.getString(5);
            }
        }
        catch(Exception e)
        {
            e.printStackTrace();
            return;
        }
    }
    //get guestID from the database
    public int getGuestID(){
        return this.guestID;
    }
    //getting roomType
    public String getRoomType(){
        return this.roomType;
    }
    //getting roomNo
    public String getRoomNo(){
        return this.roomNo;
    }
    //getting rate
    public String getRate(){
        return this.Rate;
    }
    //getting availability
    public String getAvailability(){
        return this.availability;
    }
}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class GuestsInfo
{
    private String  firstName, lastName, gender, address, time, deposit, age, contactNo, stay;
    private int  guestID;
    private Connection con;
    private PreparedStatement statement;
    //default constructor
    public GuestsInfo()
    {
        try {
             Class.forName("com.mysql.jdbc.Driver");
             con = DriverManager.getConnection(
                            "jdbc:mysql://localhost:3306/3moronsdb","root","");

        }
        catch (Exception e) {
             e.printStackTrace();
        }
    }
    public GuestsInfo(int guestID)
    {
        this();
        try{
            statement = con.prepareStatement("SELECT * FROM guest WHERE guestID=?");
            statement.setInt(1, guestID);
            ResultSet rs = statement.executeQuery();
            while(rs.next()){
                this.guestID = rs.getInt(1);
                this.firstName = rs.getString(2);
                this.lastName = rs.getString(3);
                this.age = rs.getString(4);
                this.gender= rs.getString(5);
                this.address= rs.getString(6);
                this.contactNo = rs.getString(7);
                this.time= rs.getString(8);
                this.stay = rs.getString(9);
                this.deposit = rs.getString(10);
                System.out.print(firstName +""+ lastName +""+ age +""+ gender +""+ address +""+ contactNo +""+
                        time +""+ stay +""+ deposit);
            }
        }catch(Exception e){}
    }
    public GuestsInfo(String firstName, String lastName, String age, String gender,
            String address, String contactNo, String time, String stay,  String deposit)
    {
        this();
        try
        {
            statement = con.prepareStatement("Insert into guest(firstName,lastName,age,gender,address,contactNo,time,stay,deposit)values(?,?,?,?,?,?,?,?,?)");

                statement.setString(1, firstName);
                statement.setString(2, lastName);
                statement.setString(3, age);
                statement.setString(4, gender);
                statement.setString(5, address);
                statement.setString(6, contactNo);
                statement.setString(7, time);
                statement.setString(8, stay);
                statement.setString(9, deposit);
                statement.executeUpdate();
        }
        catch(Exception e)
        {
            e.printStackTrace();
            return;
        }
    }
    //get guestID from the database
    public int getGuestID(){
        return guestID;
    }
    //get firstName from the database
    public String getFirstName(){
        return this.firstName;
    }

    //get lastName from the database
    public String getLastName(){
        return lastName;
    }
    //get age from the database
    public String getAge(){

        return this.age;
    }

    //get gender from the database
    public String getGender(){
        return this.gender;
    }
    //get address from database
    public String getAddress(){
        return this.address;
    }
    //get contactNo from the database
    public String getContactNo(){
        return this.contactNo;
    }
    //get time from database
    public String getTime()
    {
        return this.time;
    }
    //get stay from database
    public String getStay()
    {
        return this.stay;
    }
    //get roomType from database
    public String getDeposit()
    {
        return this.deposit;
    }
}

...
JLabel[] bottomLeftFields = prof.getBottomLeftPanelFields();
for(int i = 0; i<data.length; i++){
                 bottomLeftFields[i].setText(" "+data[i]);
             }

                //setting text on label
                prof.setVisible(true);
...

JLabel[] bot = label.inputLabels();

JLabel[] bot = inputLabels;